Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc77a3340af6258f…

MALICIOUS

PDF

79.2 KB Created: 2021-09-04 07:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 51c8df07d8fcaec91c5df78b02507c81 SHA-1: ed64bd6dc6ddcbcaf07c3b210db600bd7fffdcab SHA-256: fc77a3340af6258ff70fed509b708ac07ff01e51543bc0ba0a87d3d551ba216e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous external URIs and link farms pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics indicate that the PDF likely attempts to redirect the user to malicious external content, potentially exploiting vulnerabilities or delivering further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://philabc.ru/uplcv?utm_term=profit+and+loss+worksheet+year+8 PDF link annotation
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/b81hsgn429b502bb7u0tkuls6b/bafubakaxuzazimiti.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/9373adc8nn65r8k4l77oj1k57j/13229638121.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/wipaverekafowekijefidukop.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/65828282972.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2e25d9798---23165767168.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/dijiraxutanagunevoxum.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/42147047610.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/7rbufvk1c3ve616r5tp2bun5ij/juripezadanilasaj.pdfIn PDF document text
    • https://seikico.net/img-tym/files/sozatul.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082fdd68deab---nokokezutogeboju.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/6184193280.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/45a428a47f39fd2232338ac43b39cc69/69243637824.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a9f4850da---xomafofitozevasobeto.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a53607da8ce---85130740732.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079dd1bd0a8a---jojevinovazodugusonav.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090158829475---tazigebewezuw.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/f63353bf3bea873abef9d3d5063ec5e6/77398106047.pdfIn PDF document text
    • http://peusch.lu/userfiles/files/69334171401.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/wuzukubig.pdfIn PDF document text
    • http://whscardinals1963.com/clients/9/9e/9e5fab02d16e7113a74bdd4e7828f974/File/fosedutetimabe.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/25356247982.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/83989392184.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/101535535472.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c4be4e875fe---xikozomikaxibozekuduwofoz.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AA 16688 bytes
SHA-256: 69e1051ba80321a06d9ac17a4557afade8edca36d830629da344ccba6799a33c
font_01_sfnt_off0000fdd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD8 10952 bytes
SHA-256: b5da060bdb5356a4f1a0ebc7726b324f20c8f7c769c8702ffd36fd29e4f5a297
font_02_sfnt_off00011749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11749 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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